Compilare: user.cpp: In function ‘void rebuild_apm(int)’: user.cpp:69:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(aux.size()<n-1) ^ user.cpp:84:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<aux.size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:126:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<apm.size(); ++j) vc+=apm[j].c; ^